I solved my problem...
For reference, the code I am referencing from the OSG Quick Start Guide is this:
Code:
double w( .05 ), h( .05 );
osgUtil::PolytopeIntersector* picker =
new osgUtil::PolytopeIntersector(
osgUtil::Intersector::PROJECTION,
x-w, y-h, x+w, y+h );
osgUtil::IntersectionVisitor iv( picker );
viewer->getCamera()->accept( iv );
Shortly after I posted, I saw that osgUtil::IntersectionVisitor contains a
function setLODSelectionMode(). I tried setting this to
USE_EYE_POINT_FOR_LOD_LEVEL_SELECTION but it had no effect. I did a bit more
investigating and saw that this enum is referenced in
IntersectionVisitor::getDistanceToEyePoint(). However, LOD::traverse() calls
NodeVisitor::getDistanceToViewPoint(), which is not implemented in
IntersectionVisitor.
I was able to derive from IntersectionVisitor and implement
getDistanceToViewPoint() similarly to getDistanceToEyePoint():
Code:
if (_lodSelectionMode==USE_EYE_POINT_FOR_LOD_LEVEL_SELECTION)
{
return (pos-getViewPoint()).length();
}
else
{
return 0.0f;
}
then used the subclass in my picking code, after which I got the desired effect.
Is this something that should be added to osgUtil::IntersectionVisitor?
...
Thank you!
Cheers,
Michael
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=49653#49653
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